SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c76068762c52580b6180a33db676ccea0b875247933d95be0f050437092220' 
  AND token = 'kcD3wlKvMzyREsvC7OZPj+HjyVZjmfW72NvUggJ+IF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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