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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b76a055aebfe790ff0f9b6c2f79049c4ec48a553879822907cabcae9c5872f' 
  AND token = 'zPwm13eWfe52T49D2fymT5tytKI3k+mhbGx/4UkoCVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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