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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2491bd90930e5dd91ab837e49ecbe3ced7afdc95c145f763b6ee622d060de7' 
  AND token = '7jLMC0hbW+m/PAMlV+eUtat9VOzdY8u30ugD0MB2qco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}