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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e51dd9671597f6bd2033275e7effccdfbf04611816377d4a9717a1c03c7a50b' 
  AND token = '0ofbrJe6ntv0joHtOAjT9Nv2pRckhndwENIxdoo1jWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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