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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9813b0c6ee41c0340f550ea39eaa4aedd1118d88684aaf2744451f7befbad349' 
  AND token = 'VS1NRNESk/mxtLaY8I5M33nX5+P+phdYzfHAxSrkxTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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