SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6a640328797f4a2b9e49145fc16fac716fc61d512dedab7cba211ebb4cd97b' 
  AND token = 'VThZ2/WLUzpuw6PMKOqVmYJgsPWcXs0k8vuV6ux10fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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