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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399b01af5a5cfdf290ee458cffc8235712d25ca5beff97c34b51d321c62c3e2d' 
  AND token = 'skddlRysFB6HF4PwKkWmMcmKhXZ6t1k6yRouWIivaDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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