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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cbb3518e2e589b1f4c5ec7174c63e98eb452a9cb3e1ae3ec05721099b56737' 
  AND token = 'A1QDCybncXeUH0BqUCeE8VWKVyWBl/7/v7eHDOfICzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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