SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d050cf83693d4a4cedfdcb676519c462c9129bccb884e37cd0c498ef84a50b' 
  AND token = 'jpFK/Y9stBGmNhpZnlvDo5p7MhVXxs2L9QCyYfzSKOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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