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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30d8e6986e3e4d24d9539a0ea215caf58c74b8b5bd452327aaa00c6908c4f34' 
  AND token = 'N5jcB72YIoVtEm2im1nopcRv+BoSDWOVa6Mo0tq+Mbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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