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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebef4985d9dde5d06ecc211abe02916a8c70bb80c8424971a4161ea53f50ddf' 
  AND token = 'nAUy8CkZLmKOcYFQzV/nw/XNv1eP5FbKklIP0E7zpOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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