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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9558e5832a87d81fe0bfd56daf7d9c6263f2bd688b89966f468eaa557e9e64' 
  AND token = 'dNHap6236V50gVXvDylhi+/yyA6wCDzVG1/PRUXxzyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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