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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d5255a085c4e8bd5696ebbdda6fa64d61969d7a21da5218921dd6275563e5b' 
  AND token = 'zFVFvQ94DaNxf/6YGPPSLDC/Oc1ifWo6P8SGq4MAOZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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