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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaf3e4f6d4d8a9f411366624d035312eef094fcf74bc1a890d8d7e2f1adeebc' 
  AND token = 'Pq2tK4L6pkTj4ZTWeKQl4yI+GKBXdRwBUv54UyhsY6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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