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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bac4dfd79677628a194ac75c65d9bcb5d1e96ceb04bfeb0c36f39db6d550e0e' 
  AND token = 'C2M5ewINK3CqTWlDDJd/WPnzWiToliuu4uZCtJsdiY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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