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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3932daa153e32c14582f6000f3123d69a77255e36d792c5cd3ee399be759309' 
  AND token = 'miszzw0L4po9W79lpK5xf0JwJVMExwT9v57ZxGkPxuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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