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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b073d96de62eb52e4f9657dc942194b201e9cd61af884189164137484390e418' 
  AND token = 'aGPP9KJW0SkKEIjdDDcvy6G04MD2jSAFcHuyzFu7os4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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