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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381d41eeb4eab8c212f1f6a128ac9a816a5a9f69d41453d5bf8f9ff9692fa7f3' 
  AND token = 'S3puVWje2W52343WFthqzdVMUuRBqW+F8XLJqhCa8gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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