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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473de6afc7bd3da0c9f484bfeafba029c955b99804d64e11946df0229320bca0' 
  AND token = 'Pp51WrlPbMrukBd4AJ2JBggL163fXQCXV19NVbYEnks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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