SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322fe9fd461adf1da381e88224a6bd4b9bea7485140c640bf153d5c41398ca9b' 
  AND token = 'P+CButLOh3XPRSIHF4RjvnJbylJLq2yNxKzUKjTIy5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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