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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798d552d3935f9715204842b96565485d925cb48f1edd61d0e580d6310330e20' 
  AND token = 'WhdNOTsrOC6cISn91I8vF6GN60USWHBXlNz/L7tURq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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