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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcd0f5ddb55d63751385ff90c834e8446cbe32bcc4f1f1404e0f43cb2aa5977' 
  AND token = 'Qdu2Im5NT/rY8VUGvRV5dcQX02aW2sTYgbGhT0sbMgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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