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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f1dabb0a52d744c7fdba4dfe7d2b181e6922cfc836d2ef1c60e794f341444a' 
  AND token = 'zsyg2NzIxbCXywjOOMCzJBJKdCd0lpowplv6hi9dw+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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