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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b4de90124bef8360851288c27ea19fb6028c12930499c3be49817ca53f501f' 
  AND token = 'TBnxWTRtXjPbE7kZ9pThbyUwakdhWyo7USkbyXipQ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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