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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1aae8df70113665aeb68c7b2ccac19f34f442a61ca351b821243826d6258644' 
  AND token = 'ZnkoSRen7gMAyjbgopQcg1g4bzMI1FXouB8OgrdY6wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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