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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb14d4b2d034db4cd033c21da8fc86d2bce5a1c83c65ca4b484ace9390be63dc' 
  AND token = 'fT4MHUhHPlxwT+ovx42wLxiTJwGY7Ft+4CaPhv4+3xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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