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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3116b124c053e7819be2a2b2649131ffff496a316413a29d0f55166ac7491700' 
  AND token = 'uj7iSf/NABklhDx6585ml93qlV95wtupCMbb8Sc5sn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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