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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4875c1dfa8221e0056e4f785468938831d391a7236f501663d76215b65b71832' 
  AND token = 'pINb4Zw7wvzvAScUvpnGt/r4k0z4Ckns2wHaMWv/45Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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