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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d23fb398ece0702b5c9f9a6a320b6b6935064c5fab87a5076b652c5bc774ee' 
  AND token = 'D0tjamXz3mTxDjT1GPB3Ofh7H38irw+eVK6Ofdj22vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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