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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bf7c1575dd2737eaf30fb8f1be6b9a884bd21db369d861eeb277715aab5d65' 
  AND token = 'kKocCgBUEASp7BAwOymbfFr9zmM1XSmdBIqg60mmqu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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