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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a28c152a3791b3dcdd43b77fc94a3686b86b99a0774ff6fa80e7099d7661cd' 
  AND token = 'C9ETuvkHhJiHP6Ka1qTrKHtxL/RUK9Sp8X1gvvJ3DUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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