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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00004a34a4a67076c99f4325b040e2c5dd2f6f7c6fc52b83e068c4dceb6ae848' 
  AND token = 'ScRS+TpXBgYpAbFM62Gx/6jTEFZs4Os+zKMD7dqH8wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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