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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bd1e75246cfba860b415a9cc7de68ede847c79191c912a7ba46f04d3bc0f6d' 
  AND token = '0rOzTm/eLVehSUZDuv3ZbTC3eR2XVSlH1sv8aTFD3iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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