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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3450e86ccd1a2df3cae31f8de75e2e47bc0c1727715ab04587b8c3a6d5c52b3d' 
  AND token = 'BTd7eZh9A8pJUi0lTb3NekUJup6amSHWL7bztBhpf7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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