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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a902a009d04360bf65a014b9cb5de25df5ae5466adeb927986bf0df23b64e90f' 
  AND token = 'CfANyNvSMN/oRoUp2cF0LZVfia72thdtNf7Ep8fsla4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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