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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fd30b7ff97c9b92f1ed0f44886bb39b50c4198fabd1d7442cf1d194f665b0c' 
  AND token = '65kcELjde/agLWH0kB5at3LrfMVw/80GWP5RIJtRlEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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