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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5690f3dad3dd5708c76ba41872ce69b860a69e58db27c5a019eef969872efce' 
  AND token = '3dhh+neW6dO6spljOFziPfnnk3l487PAy4SY447UELs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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