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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40dd520db36b3b2cdf8e332beb7b092c4e3f25339f1fd6420aec8e7551603ce0' 
  AND token = 'kBPxl1JMQm4xT6nUl29ntXj5Dg5V+j+pAiiP6yuqwwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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