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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eb7088b8d7922d750c67a222660f518e592700f162f54603d2cee6406665d8' 
  AND token = 'a372xSsTT3wMRsVsj5OLuXXwzgFLQe+B966MT+BuXg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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