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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bb9c614c714376822a16167cc9e294880c278b75c4357e27aa547e45ca4a32' 
  AND token = '36LvgxNkk9t4AMdxAUjK2ciPl9sJ/Wq4Gx/Mjw1s/Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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