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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f01d7ee4f93434271d8c975430c94fca271f0a91d9a90ec5faa072eb13e1da3e' 
  AND token = 'mFhAw3TID87ZU3v439EtmMXJrkclQ98E6AT9Bn+PB8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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