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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824430a021b5c3d51ca447eb464f197783d08c0d616c8eaeddde89864dabdeea' 
  AND token = 'fEipyQRkiZu/6GYzmBgcSTdfJkJuu1m8/fvsWN1WZ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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