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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3c2263de0023abefff5af876fa2db7661128c2d6b0d961f776fadd1f70a813' 
  AND token = 'HuSbXhp+zp4AQ+6RJ4YsSwcyv8r294Vcp3XG7fi6OcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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