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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462748332ffba7b3083bee4bd52b4d936ed40ec6bd27f5e4a63a06214b794ada' 
  AND token = 'mgR88eq4HUA2jw+zxMJJh7WAYUjUjwMayJv1va2zXRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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