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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b744e141a667160bc68e50157b7f6f91c293510bb95f73102ac642b8b8bebda' 
  AND token = 'blJutEchubQlLDt6xnip1xj79AR1JlytnzFFx7GYoxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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