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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c48e4171de97445037dfd573b33aa1d1299647e3d2dda0701ca566c1538de95' 
  AND token = 'hLTQ1+uYMfoiDVTE6Lkh9ZCV19wMJgEh9TdoJLrB/C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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