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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1b89964986f216288644ce2779149bd5962de4868ca3fbf70ee72f0bb29ec7' 
  AND token = 'Coy4pmllhNHvNSa+s6fONIab5guO3wGSu9Lp+YM3A2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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