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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d938f7cef9b0a57d6e12a45460f34e67207db131b773aa63d17a73062bfe0f' 
  AND token = 'UMvFacvetqcOMPBeMwRN29gH++RorlntCgRGwAsUB1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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