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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da13151fcab261047adc691224e08ea6055e551cc548ac12d6771d145d5f74d' 
  AND token = '/wIOqxzTTW/ndgad9tirZIOK0z1GhU0dYBc2WhHUzfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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