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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160f099f54f5f581ab56e8c3ef2b7c55f0568bdec5c64aff991d4673f3b14baa' 
  AND token = '4cs4O9omW7T+5lZKCbcGtq7L+04B0JKVpHu2/P4IE48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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