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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1cf1ba57515bfd0e5829c054c6170f73ffcfc4512d7573f93d0468a9fd0de1d' 
  AND token = 'di84nwJNsZDvnEV6VwGpQeUa2TB/l7zFNyMZ3ZJF8bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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