SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebef9e01f5513ccff7453729d52cecf7969a2aa7d4168cf2b48a3c536763109' 
  AND token = 'jIZMvVwaSHKNVKisXhIAOL3nNZCsRgxkJhPZQ4NclOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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