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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c011cc9060ca03a41affa0d76d439f609b6bb73959fe0f137e0d845ac5c82790' 
  AND token = '1+GggrU/xzy3iR4TfDPA/xa+ZJbgOJdOO9nqQrZJK9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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