SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841f7de654871fbaa2f6d5d1ec5f52486b97e341e86486198b04f244e39f3d06' 
  AND token = 'LTjOjmaf+176xhUUb/W/1OY+Q9Aki8pBZP4NFeWQCKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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