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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ba4d1193c148d18466f573cb2884eb1be6c86638f77c1cc7f46783228eab8a' 
  AND token = 'szYgr0Fdsp8fGjthR9uze1iSJgEp0sh9qPbBmiMrG9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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