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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa65d5e458c6c847ec77b69bc7dbd59c487694437c127539496994c5a39823b' 
  AND token = 'gAwlMmqODwFFJRvuj0jSU7KpXs0s80R6Ro1zozCXwIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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