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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688ea93bc0c92393bc1a3648c378852b342abf9970ace0920b2b4a30ef82aeda' 
  AND token = 'rC/wOXEGqsl4bO04yo0JA6kbWNLruqBGqJ4atwxpHJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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