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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79afe9adb6cfcaf7c8bfcec0d80b936bc94005c6e327d53794dd16db2e8f3348' 
  AND token = '6xD1G9+D9Db6viZrKMfkfgJDr5delITvpIWFbOCfgVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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