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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488de387ce49a7d06bf56c7a7b816e8448bf4a9607a9eea0037878f8f96d520f' 
  AND token = 'DvzCTJ4er5PHn09L4ku6q6a7oTzjP0cP7a/QJ2grrZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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