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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1932fb9b9c8b34af5240628926011699b1c3a491a67500468b699df57c72459' 
  AND token = 'zSnecbQLUc5DZMzIu8zGvg27mUOt50we7ij/sIH26zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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