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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fc950b67f473928f03becb7e7619809e8cc47ff393d5ade83b4d0a9ede9f5a' 
  AND token = 'N8vjlwAPttP4ofEVcT2O734JKWURIhXUlVZNqd2V7ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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