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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f6929cbf038591e59b4067abbc7fbb83326e231b6e1973bae0298177f591ea' 
  AND token = 'zfDSj1B57kg3PtlTv0z02BZj+sqQzNyh795oGhNHEJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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