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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7b5bb4b056ac311f058123af80d06a08fea816732fed3ae099f00088520a73' 
  AND token = 'altbaN7qYKzg+QwShiS8P/n62ZdS337wa2gfbWg5bPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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