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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639a5005dd1c0d207336e3e0c4929747cf825a401b6a358d325fbf065ab6ea54' 
  AND token = 'LnfU9FrXBJVV1mwEgtMCjS0JusoaGPATUF9WJpcCcGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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