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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb9ec17f30aeae7799c0c25373a4ed7d45637c9bdbbb4b5ee953d9dc9f7f2b7' 
  AND token = 'Q4nsnH7vzV2LsT9iZ8X9pPA5J9VXAdsHnLrHrd08Tkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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