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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b92d73e660a181709ca39c5a942b317c043663c761baa75e9aa3039019b0e14' 
  AND token = '7k3o1iusuwn6nZFKdi83yyHnrCWYuRwaYbxKtjStWxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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