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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb24938721d4916a43b5b468635eac5462c2d8a0a0f0bb3edba2d199f2b3c8f' 
  AND token = 'P/7CfDlecpZuqgmmH3t1nRie5VFaW15MwkpI0XR8EvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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