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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e41ee74f1dec838d081a8f84c1d5b731dc3578e1c1b553ee6731c52b5c88cf4' 
  AND token = '6AwLCmdVYExdybaDUbZqKJkOMc2l9RaCUOx6VFdHTqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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