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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301df9201ad2522267913755e7c13b191219ad45c31972f84afe0d6c39a986c9' 
  AND token = 'BgRrT/+5D+KYV2dA7uoOZljBoK+UtWp6tIxtIbkMf04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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