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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6924c0b964ad5ff6cfb2b6089d7ab4f41959de4af14e97c0a8a5e261e8b9a7' 
  AND token = 'szt9lK3FLQ0n4W0s2T4AkapFw953djCpHIJPlVbC6lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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