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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609be3bcb21969bce65b4d936626514de9384b74dde02ee1a16dcdf601305747' 
  AND token = 'GVa38xTS58xho34+XmyHY1dXj0EpBaBkf/RbUNdYFDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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