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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c597117e1f905eb4d5906d4b575b2d6691ce35826d0c3c9eb6aa96f9e4bbc38' 
  AND token = 'Ow8RvyXTw7lDBJqG9A2BjDYRUwUF22dXQrn1vIUnBc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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