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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6a739fe349caa234a28bfbb2d76e6ccac8efc1192907bd933c21c229144b73' 
  AND token = 'mYWZcmI+fyDxLOrs2MNLp2rbuUYKwVpyu7ABWwfCwNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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