SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c5bf05b2db2347556bd66f9a46c2e232a5f18318f6c6064d2ff7b9eaf3d1c2' 
  AND token = 'FfOAjpyjrNX9xRAp+FvfRqPLPJlK4t9ZFvFBNgHB53Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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