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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e9d278b91edd38095015c93123719f3f3bd2857f100f62385687d254d91224' 
  AND token = 'AORzZFT4OTHVDc53xty0RUab76ATIQqIEiJ0Cf0kSjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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