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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ed59b44844fd3874c54cb3361a60cfa1a71a2d3ea88cafebf605a50c710cec' 
  AND token = 'PBNiOztwA0XAbFaWVaSOtguGEjCwqmzTeqyQDTqWETo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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