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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866e2210b79832974f44e45651bb0b30c352105446e615d651a6839e0913d005' 
  AND token = '9FCjBygpxvpX6wI6Fz+Z97BTtKopyj1eINCqtaYE5yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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