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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d62800f10ebb44f18c1190f141bfe1f6782c46725040e00536b4828f827c9d' 
  AND token = 'a4uMcwoCy/imRS+1N08Y5JrYaPj1DllcuLtfegRvJQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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