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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32f7304abf38723b570e38e48620a1633953bb8e550d1793fdec13d8ca95522' 
  AND token = 'kxKVMPjswMLwam2Y/qoDuNLHut3/E31pXVYxATc69BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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