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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ed8f1c4a91ccea1f9da9e21fc3774beeb0e406a3d05a88aba2f14d2a633454' 
  AND token = 'mI5XVS92DVKQtAYcKslqlIfYTY3SFPJ3hVPkn8tVVbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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