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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b28f330a09bfe87b62c538720a3f3ae741221ea8377945a3d80be26473b7e0' 
  AND token = '1b9m40wAgjk2vp/sgFNMvscFP0dV27azAXGYseJ4izA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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