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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038af701ae738a12ce3bf52988c18ab63be8025df038222229237b53646585c8' 
  AND token = '8xjLHeBCqN0a/KtoViP6N+BnvKbo4foJlhhwoCGKoC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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