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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6c45a0c9031f7125748857b1f9bc6ea5879cc722d1742d111d4dce74832e6a' 
  AND token = 'KsCR41RUbVonMbVUx66HTHFBvaSVvb8dlZHmNFQ9tto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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