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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36e82f104d495e681d4336c090729498afc4fd2630f94fcc615236c8f51c7b6' 
  AND token = '0U1BMaJbLFdcN8dB6X2PQIbzPXImCAeYFB4GgsN+s4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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