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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0d3f1cf0e56e5fd8f82f821b351c1353ef2d91ab80bb0bb1e23fb8f74d3633' 
  AND token = 'f0VHjBV+FtKKa/4EMlbQtP6zLaJ+hZ1LT/xns3rQxqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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