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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce934e644b4bb18f215e730cfec585886442b58f245b2bb68173d3bdf80958fa' 
  AND token = '8lWs5B74jGF7/uDDx/CJjtzNK6KA0yJ7hUIRrTxnXkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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