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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb94095497c9981507fa43af9537ea533ef80c66306c12227084ecf8ee7e1aa9' 
  AND token = 'Ciedme2oj4HQ+z0XlNAmm/S07uZxUG97qBzNlZcuguU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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