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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9c0ee558618cb0346e11e0f227f7c5f9f5f64a2b16b9ce3466bb7898fcb626' 
  AND token = 'RPdPeKba87ym5jRSlahA1s51MqE1OMuQXoHq7O2u0h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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